Frederick henry smith



(No Model.)

F. H. S MITH.

VENTILATOR.

No. 327,608. Patented Oct. 6, 1885.

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UNITED STATES PATENT FREDERICK HENRY SMITH, or WINGHMORE HILL, oouurr orMIDDLESEX,

ENGLAND.

VENTILATOR.

SPECIFICATION forming part of Letters Patent No.327,608, dated October6,1885.

Application filed October 14, 1884. Serial No. 145,537. (No model.)Patented in England October 22, 1881, No. 4,638.

To all whom it may concern.-

Be it known that I, FREDERICK HENRY SMITH, a subject of the Queen ofGreat Brit aim, and residing at W'inchmore Hill, in the county ofMiddlesex, and Kingdom of Great Britain, have invented certain new anduseful Improvements in Ventilators, (for which I have obtained LettersPatent in Great Britain, dated October 22, A. D. 1881, No. 4,638,) andto I do hereby declare that the following isafull, clear, and exactdescription of the invention, which will enable others skilled in theart to which it appertains to make and use the same.

My invention relates to ventilators for ven- 1 tilatiug rooms and otherclosed spaces generally,where it is required to remove warm or vitiatedair from such rooms or spaces, and to introduce cold or fresh airthereinto, in place of the said warm or vitiated air, without producingobjectionable drafts of air in such rooms or spaces; and in order thatmy said invention may be most clearly understood I will now proceed todescribe the same by the aid of the accompanying sheet of drawings.

Figure 1 is a section of my improved ventilator, and Fig. 2 shows thesame applied to the ventilation of the rooms of a house.

In Fig. 1, E is a disk with a central opening, 1.

J is a false cover, of a shape somewhat similar to the disk E below it,but projecting upward, so as to form a kind of neck, L, with a centralopening, K, therein concentric with but rather smaller than that in thedisk E. 5 The outer edge of the false cover J is bent down, so as toform a rim,which fits and rests on the upper side of the disk E, or thefalse cover J may be supported above the disk E by other suitable means.The false cover J is perforated near its outer edge with several holes,P P, for the admission of cold air into the space between the said falsecover J and the disk E.

O is a cover with a hole in its oeuter,which 5 drops over and surroundsthe neck L of the false cover J, preferably so as to leave a narrowannular opening, N, between itself and the said false cover J.

M is an outlet pipe or chimney, which, commencing at the hole in thecenter of the cover 0, is continued to any suitable point where theheated or vitiated air is to be discharged.

R is an inlet-pipe for fresh air, which opens into the space between thecover 0 and the false cover J, and is continued to anysuitable pointwhere fresh air can be received into it.

In Fig. 2 the above-described ventilator is shown applied to the ceilingof the room A, for the purpose of ventilating that room. I introduce thecold air intended to replace the heated or vitiated air removed from theventilator into the lower part of the room or chamber A by pipes, tubes,or other conduits or channels U, the upper ends of which are carried upto aheight equal (or nearly so) to that of the outlet-openings M,orinsome cases, the conduits or channels U may simply pass through the wallsand terminate in gratings or otherwise, the vertical extensions of suchconduits or channels being omitted. The result of these 73 arrangementsis that cold air enters thelower part of the room or chamber A throughthe aforesaid pipes or conduits U below the warm or vitiated air, whichrises upward toward the above-described veutilatorin the ceiling, caus-7 ing a current of warm or vitiated air through the outlet M thereof,which current induces another current of cold air to flow through thefreshair inlet-pipe B into the space between the cover 0 and the falsecover J, thence through the holes P P (see Fig. 1) into the spacebetween the false cover J and the disk E, from whence it passes up thechimney or outlet M in a thin sheet or stream of cool air surroundingthe inclosed column of warm or 8 5 vitiated air. Part of the current ofcold air admitted into the space between the cover 0 and the false coverJ escapes in an annular stream through the opening N ,when such openingis provided. By these means all possic bility of. downdraft is obviated.The arrows in the figures show the course of the air-currents, thecurrents of cold air being indicated by arrows without wings and thecurrent of warm air by arrows with wings. 9

A modification of the abovedesoribed arrangements is shown iuthe upperpart ofFig.

2 applied to the ceiling of the room T, the only material differencebeing that the cover O and air-pipe R are dispensed with, and the IOC.

cold airadmitted through the eonduitor channel U travels freely alongthe rectangular channel formed by two adjacent floor-joists, the floorabove, and the ceiling below, and entering the space between the disk Eand the false cover J through the holes 1? I as before. Fig. 2 alsoshows the ventilator applied to a fire-place, the various parts of theventilator corresponding to the parts described in reference to Fig. 1being indicated by similar letters of reference. These parts are fixedin the upper part of the fire-place A, as shown, and the heated productsof combustion pass up the neck L and chimney M in the same manner asdescribed in reference to the ventilators applied to the ceilings of therooms A and '1, cold air being supplied to the space between the diskfor the purpose ofprevcnting downdrafts in the chimney, the means foradmitting air between the parts E and J or between L and M beingarranged according to the construction of the chimney top, pot, or cowl.Similar arrangements are also applicable to the ventilation of kilns,closed vehicles, or other places where it is required to remove warm orvitiated air, and to introduce cold or fresh air in place thereof.

I claim- 1. For ventilating purposes generally, the

combination of the disk E, having an opening, I, in the center thereof,the perforated false cover J,having a central opening, K, thereinconcentric with but smaller than the opening [in the disk E, the neck L,attached to or forming part of the false cover J, and the outlet pipe orchimney M, external to the neck L, the whole constructed, arranged andoperating so that the warm or vitiated air escaping by the outlet pipeor chimney M shall induce currents of cold or fresh air to be drawn inthrough the holes Pin the false cover J, and be caused to traverse thespaces between the disk E and the false cover J, and between the neck Landthe outlet pipe or chimney M, substantially as hereinbeforedescribed, and illustrated in the drawings hereto annexed.

2. For ventilating purposes generally, the combination of the diskE,having an opening, I, in the center thereof, the perforated falsecover J, having a central opening, K, therein concentric with butsmaller than the opening I in the disk E,the neck L, attached to orforming part of the false cover J, the cover O,the fresh-air inlet R,and the outlet pipe or chimney M, external to the neck L, the whole constructed, arranged, and operating so that the warm or vitiated airescaping by the outlet pipe or chimney M shall induce currents of coldor fresh air to be drawn in through the holes P in the false cover J,and be caused to traverse the spaces between the disk E and the falsecover J, and between the neckL and the outlet pipe or chimney M and thecover 0, substantially as hereinbefore described, and illustrated in thedrawings hereto annexed.

FREDERICK HENRY SMITH.

\Vitnesses:

STEPHEN EDWARD GUNYON,

7 ICkb'lWf/h Road, Upper Clapton, London.

WILLIAM ANDERSON SMITH,

23 Farleigh Road, Stoke Newington, London.

